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Preliminary 8
Typical Applications * CDMA/FM Cellular Systems * Supports Dual-Mode CDMA/AMPS * Supports Dual-Mode CDMA/TACS
RF2449
CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHZ DOWNCONVERTER
* General Purpose Downconverter * Commercial and Consumer Systems * Portable Battery-Powered Equipment
Product Description
The RF2449 is a receiver front-end designed for the receive section of dual-mode CDMA/FM cellular applications. It is designed to amplify and downconvert RF signals, while providing 30dB of stepped gain control range. Features include digital control of LNA gain, mixer gain, LNA IIP3, and power down mode. Another feature of the chip is adjustable IIP3 of the LNA and mixer using an offchip current setting resistor. The LNA IIP3 can be digitally controlled between two levels to reduce current draw in CDMA standby and other conditions where high IIP3 is not required. Noise Figure, IP3, and other specs are designed to be compatible with the IS-98 specification for CDMA cellular communications. The IC is manufactured on an advanced Silicon Bipolar process and packaged in an SSOP-24. Optimum Technology Matching(R) Applied
Si BJT GaAs HBT SiGe HBT GaAs MESFET Si CMOS
24 LO IN 23 GND2 22 GND2 21 VCC2 20 IF2+ 19 IF218 BYPASS 17 IF116 IF1+ 15 GND3A 14 MIX IN 13 GND3B
0.157 0.150
0.0098 0.0040
1
0.344 0.337
0.012 0.008
0.025 0.0688 0.0532
0.2440 0.2284 8MAX 0MIN
8
0.0098 0.0075
0.050 0.016
Package Style: SSOP-24
!Si Bi-CMOS
ENABLE 1 IP SET 2 IF SEL 3 LNA GAIN 4 MIX GAIN 5 LNA IN 6 VCC1 7 GND1B 8 GND1A 9 LNA OUT 10 11 12
Features * Complete Receiver Front-End * Stepped LNA/Mixer Gain Control * Adjustable LNA/Mixer Bias Current * Adjustable LNA/Mixer IIP3 * Digital LNA IIP3 Control * Meets IS-98 IMD and Single Tone
Ordering Information
RF2449 RF2449 PCBA CDMA/FM Low Noise Amplifier/Mixer 900MHz Downconverter Fully Assembled Evaluation Board Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Functional Block Diagram
RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Rev A4 001016
8-75
FRONT-ENDS
RF2449
Absolute Maximum Ratings Parameter
Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature
Preliminary
Rating
-0.5 to +5.0 +6 -40 to +85 -40 to +150
Unit
VDC dBm C C Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s).
Parameter
Overall
RF Frequency Range LO Frequency Range IF Frequency Range
Specification Min. Typ. Max.
Unit
Condition
T = 25C, VCC =2.75V, RF=880MHz, LO=990MHz@0dBm, IF = 110MHz, VIPSET <1.0V
869 to 894 760 to 1010 0.1 to 250 14 15 2.3 +6 40 3.5 -6.3 6.3 20 0 12 +2 29 13 6.5 +3 21 3 +12 35.5 4 13 +13 16 -10 40 40 35 -3 0
MHz MHz MHz dB dB dBm dB mA dB dB dBm mA 3k balanced load. 7.5 dB dB dBm dB mA dB dB dBm dB mA dBm dB dB dB
LNA - High Gain Mode
Gain Noise Figure IIP3 LNA Out to Mixer in Isolation Current 2.5
IIP3 is adjustable.
8
FRONT-ENDS
LNA Bypass
Gain Noise Figure IIP3 Current
Mixer - High Gain Mode
Gain Noise Figure IIP3 RF to IF Isolation Current
IIP3 is adjustable - See Data Plots.
Mixer - Low Gain Mode
Gain Noise Figure IIP3 RF to IF Isolation Current 14
3k balanced load.
IIP3 is adjustable - See Data Plots.
Local Oscillator Input
Input Level LO to IF Isolation LO to RF Isolation LO to LNA Input Isolation
Cascade (Mode 1)
Gain Noise Figure IIP3 24 -10 25 2.9 -9 27 dB dB dBm
Any gain state. (LNA Gain High, Mix Gain High) With -3dB image rejection filter. 3k balanced IF load. Single sideband. (LNA Gain High, Mix Gain Low) With -3dB image rejection filter. 3k balanced IF load. Single sideband.
Cascade (Mode 2)
Gain Noise Figure IIP3 16.0 4.7 0 dB dB dBm
8-76
Rev A4 001016
Preliminary
Parameter
Cascade (Mode 3)
Gain Noise Figure IIP3 3.5 16 +11.8 dB dB dBm
RF2449
Specification Min. Typ. Max. Unit Condition
(LNA Gain Low, Mix Gain High) With -3dB image rejection filter. 3k balanced IF load. Single sideband. (LNA Gain Low, Mix Gain Low) With -3dB image rejection filter. 3k balanced IF load. Single sideband.
Cascade (Mode 4)
Gain Noise Figure IIP3 -5 22.5 +18.0 2.75 3.9 10 dB dB dBm V A
+16.0 2.65
Power Supply
Voltage Power Down Current Enable<1.0V
8
FRONT-ENDS
Rev A4 001016
8-77
RF2449
Pin 1 Function ENABLE Description
This pin is used to enable or disable the RF2449. A logic high (>2.0V) enables the circuitry. A logic low (<1.0V) disables the circuitry.
Preliminary
Interface Schematic
ENABLE
2
IP SET
Controls the setting of the LNA current. A logic low (<1.0V) selects the internal resistance (49.5k), resulting in an LNA current of 3.5mA. A logic high (>2.0V) selects the external resistance at pin 12. Determines which IF port is active. A logic low (<1.0V) activates IF1 and deactivates IF2. A logic high (>2.0V) activates IF2 and deactivates IF1. Controls the bypass feature of the LNA. A logic low (<1.0V) selects the bypass mode. A logic high (>2.0V) turns on the LNA.
IP SET
3
IF SEL
IF SEL
4
LNA GAIN
LNA GAIN
5
MIX GAIN
Controls the bypass feature of the mixer pre-amp. A logic low (<1.0V) selects the bypass mode. A logic high (>2.0V) turns on the pre-amp.
MIX GAIN
6
LNA IN
LNA input pin.
LNA OUT
MIX GAIN
8
7 8 9 10 11 12 13 VCC1 GND1B GND1A LNA OUT ISET2 ISET1 GND3B
VCC pin for all circuits except the LO. LNA ground pin. Package ground pin. LNA output pin. An external resistor connected to this pin sets the current of the preamp and the mixer. An external resistor connected to this pin sets the current of the LNA when IP SET is high (see pin 2). Ground pin for pre-amp circuit. See pin 6. See pin 6. FRONT-ENDS
GND1B
VCC2
MIX IN
GND3B
14 15 16
MIX IN GND3A IF1+
Mixer pre-amp input pin. Ground pin for the mixer circuits. First differential output pin for the first mixer.
See pin 13.
IF1-
IF1+
8-78
Rev A4 001016
Preliminary
Pin 17 18 19 Function IF1BYPASS IF2+ Description
Second differential output pin for the first mixer. Bypass pin for the LO bias reference. First differential output pin for the second mixer.
RF2449
Interface Schematic
See pin 16.
IF2-
IF2+
20 21 22 23 24
IF2VCC2 GND2 GND2 LO IN
Second differential output pin for the second mixer. VCC pin for the LO circuits. Ground pin for the LO circuits. Ground pin for the LO circuits. Local oscillator input pin.
See pin 20.
LO IN
8
FRONT-ENDS
Rev A4 001016
8-79
RF2449
Application Schematic
Preliminary
VCC
LO IN 56 ENABLE IP SET 1 IF SEL 2 LNA GAIN 3 MIX GAIN 4 5 33 nF 6 7 1 nF 6.8 nH 510 100 pF 19 21 20 22 23 24
100 pF
1 nF
L2
L1 C1
C2
Filter IF2+ IF2-
C1
L
R
RF IN VCC
30 nH 6.8 nH
100 pF 18 17 16 15 14 L1 12 13 1.5 nH 33 nF RF SAW Filter 1 nF C1 L2 VCC R C1 L
*
8 9 10
3.0 pF
8
FRONT-ENDS
11 22 k 33 k
C2
Filter IF+ IF-
*NOTE: Microstrip Inductor, ZO = 50 , L = 100 mils Suggested component values for 85.38 MHz IF and ROUT = 1 k: L1 = 470 nH C1 = 10 pF R = 7.5 k
22 nH
Output Interface Network
L1, C1 and R form a current combiner which performs a differential to single-ended conversion at the IF frequency and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to the following equation:
1 - 1- - 1 R = -------------------- - ----- 4 R OUT R P
where ROUT is the desired output impedance and RP is the parasitic equivalent parallel resistance of L1. C1 should be chosen as high as possible, while maintaining an RP of L1 that allows for the desired ROUT. L2 and C2 serve dual purposes. L2 serves as an output bias choke, and C2 serves as a series DC block. In addition, L2 and C2 may be chosen to form an impedance matching network if the input impedance of the IF filter is not equal to ROUT. Otherwise, L2 is chosen to be large and C2 is chosen to be large if a DC path to ground is present in the IF filter, or omitted if the filter is DC blocked. Rev A4 001016
1 f IF = ----------------------------------------------L1 2 ----- ( C1 + C EQ ) 2
Where CEQ is the equivalent stray capacitance and capacitance looking into pins 16 and 17. An average value to use for CEQ is 2.5pF. R may then be used to set the output impedance according to the following equation:
8-80
Preliminary
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
313 ps Electrical Delay @ 880 MHz 0.09 dB Line Loss
RF2449
P1 P1-1 1 2 P1-3 3 CON3 IP SET GND ENABLE P2-3 P2-1
P2 1 2 3 CON3 LNA GAIN GND IF SEL P3-3 C20 22 pF
P3 1 2 3 CON3 NC GND MIX GAIN P4-3 P4-1
P4 1 2 3 CON3 VCC1 GND VCC2
J6 LO IN
50 strip R6 56
VCC2 C19 100 pF L8 220 nH C12 100 pF C13 1 nF
VCC1
50 strip 50 strip 50 strip C14 8 pF
268 ps Electrical Delay @ 110 MHz 0.025 dB Line Loss
ENABLE IP SET IF SEL LNA GAIN MIX GAIN L2 30 nH 50 strip C1 33 nF
1 2 3 4 L1 6.8 nH 5 50 strip 6 7 C2 1 nF C3 100 pF
24 23 22
50 strip 50 strip 21 20 19 50 strip 18 17 16 15 14 13 L4 1.5 nH 50 strip 50 strip 50 strip C18 100 pF 50 strip 9 50 strip 10 L3 6.8 nH VCC2 C4 1 nF C5 100 pF R1 510 R2 22 k R3 33 k 11 12
2449400A
J5 IF2 OUT
50 strip L9 470 nH R5 5.6 k
C15 5 pF C16 5 pF
440 ps Electrical Delay @ 880 MHz 0.14 dB Line Loss
J1 LNA IN
50 strip
VCC1
410 ps Electrical Delay @ 880 MHz 0.13 dB Line Loss
*
8
C7 5 pF L7 470 nH R4 5.6 k C8 5 pF C9 8 pF
268 ps Electrical Delay @ 110 MHz 0.025 dB Line Loss
J2 LNA OUT
50 strip
C6 3.0 pF
50 strip
50 strip
J4 IF1 OUT
NOTE: LE Microstrip Inductor, ZO = 50 , L = 100 mils For IF Freq. = 85 MHz C14, C15, C5, C6 = 8 pF L6 and L8 = 470 nH C7 and C13 = 15 pF
8
FRONT-ENDS
50 strip
L6 220 nH 50 strip C17 33 nF L5 22 nH
C10 100 pF
C11 1 nF VCC1 J3 MIXER IN
290 ps Electrical Delay @ 880 MHz 0.07 dB Line Loss
50 strip
Rev A4 001016
8-81
RF2449
Evaluation Board Layout Board Size 2.0" x 2.0"
Board Thickness 0.040", Board Material FR-4, Multi-Layer
Assembly Top
Preliminary
8
FRONT-ENDS
Inner 1
Inner 2
8-82
Rev A4 001016
Preliminary
Back
RF2449
8
FRONT-ENDS
Rev A4 001016
8-83
RF2449
25.0
Preliminary
LNA - IIP3 (Low Gain Mode) LNA - IIP3 (High Gain/Low IP Mode)
9.0 8.0
20.0
7.0 6.0
IIP3 (dBm)
IIP3 (dBm)
15.0
5.0 IIP3, -30 4.0 3.0 2.0 1.0 IIP3, 25 IIP3, 85
IIP3, -30 10.0 IIP3, 25 IIP3, 85
5.0
0.0 2.7 2.8 2.9 3 3.1 3.2 3.3
0.0 2.7 2.8 2.9 3 3.1 3.2 3.3
VCC (V)
VCC (V)
8.0
LNA - IIP3 (High Gain/High IP Mode)
-6.0
LNA - S21 (Low Gain Mode)
7.0
-6.1
8
FRONT-ENDS
IIP3 (dBm)
6.0
-6.2
5.0
-6.3
S21 (dB)
4.0 IIP3, -30 3.0 IIP3, 25 IIP3, 85 2.0
-6.4
S21, -30 S21, 25 S21, 85
-6.5
-6.6
1.0
-6.7
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
-6.8 2.7 2.8 2.9 3.0 3.1 3.2 3.3
VCC (V)
VCC (V)
15.0 14.9 14.8 14.7
LNA - S21 (High Gain/Low IP Mode)
15.4 15.3 15.2 15.1 15.0
LNA - S21 (High Gain/High IP Mode)
S21 (dB)
14.6 14.5 14.4 14.3 14.2 14.1 2.7 2.8 2.9 3.0 3.1 3.2 3.3
S21 (dB)
14.9 14.8 14.7 14.6 14.5 14.4 2.7 2.8 2.9 3.0 3.1 3.2 3.3 S21, -30 S21, 25 S21, 85
S21, -30 S21, 25 S21, 85
VCC (V)
VCC (V)
8-84
Rev A4 001016
Preliminary
LNA - Noise Figure (Low Gain Mode)
RF2449
3.0
8.0
LNA - Noise Figure (High Gain/Low IP Mode)
7.0 2.5 6.0 2.0 5.0
NF (dB)
NF (dB)
4.0
1.5
3.0
NF, -30 NF, 25 1.0
NF, -30 NF, 25 NF, 85 0.5
2.0
NF, 85
1.0
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
VCC (V)
VCC (V)
3.0
LNA - Noise Figure (High Gain/High IP Mode)
2.5
8
2.0 1.5 NF, -30 1.0 NF, 25 NF, 85
0.5
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
VCC (V)
Rev A4 001016
8-85
FRONT-ENDS
NF (dB)
RF2449
16.0
Preliminary
Mixer - IIP3 (Low Gain Mode) Mixer - IIP3 (High Gain Mode)
6.0
14.0 5.0 12.0 4.0 10.0
IIP3 (dBm)
IIP3 (dB)
8.0
3.0
6.0
IIP3, -30 IIP3, 25 2.0
IIP3, -30 IIP3, 25 IIP3, 85
4.0
IIP3, 85 1.0
2.0
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
VCC (V)
VCC (V)
36.8 36.6 36.4 36.2
Mixer - RF to IF1 Isolation (Low Gain Mode)
30.0 29.8 29.6 Isolation, -30 Isolation, 25
Mixer - RF to IF1 Isolation (High Gain Mode)
8
RF to IF1 Isolation (dB)
Isolation, -30
RF to IF1 Isolation (dB)
29.4 29.2 29.0 28.8 28.6 28.4 28.2 28.0
Isolation, 25 Isolation, 85
36.0 35.8 35.6 35.4 35.2 35.0 34.8 34.6 2.7 2.8 2.9 3.0 3.1
Isolation, 85
FRONT-ENDS
3.2
3.3
2.7
2.8
2.9
3.0
3.1
3.2
3.3
VCC (V)
VCC (V)
43.0 42.8 42.6
Mixer - LO to IF1 Isolation (Low Gain Mode)
44.2
Mixer - LO to IF1 Isolation (High Gain Mode)
44.0
43.8
LO to IF1 Isolation (dB)
42.4 42.2 42.0 41.8 41.6 41.4 41.2 2.7 2.8 2.9 3.0 3.1 3.2 3.3 Isolation, -30 Isolation, 25 Isolation, 85
LO to IF1 Isolation (dB)
43.6
43.4
Isolation, -30 Isolation, 25 Isolation, 85
43.2
43.0
42.8
42.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3
VCC (V)
VCC (V)
8-86
Rev A4 001016
Preliminary
Mixer - LO to RF Isolation (Low Gain Mode)
RF2449
49.5 49.0 48.5
46.5 46.0 45.5
Mixer - LO to RF Isolation (High Gain Mode)
LO to RF Isolation (dB)
45.0 44.5 44.0 43.5 43.0 42.5 42.0 2.7 2.8 2.9 3.0 3.1
LO to RF Isolation (dB)
Isolation, -30 Isolation, 25 Isolation, 85
48.0 47.5 47.0 46.5 46.0 45.5 45.0 Isolation, -30 Isolation, 25 Isolation, 85
3.2
3.3
2.7
2.8
2.9
3.0
3.1
3.2
3.3
VCC (V)
VCC (V)
16.0
Mixer - Noise Figure (Low Gain Mode)
8.0
Mixer - Noise Figure (High Gain Mode)
14.0
7.0
12.0
6.0
8
FRONT-ENDS
3.3
10.0
5.0
NF (dB)
8.0
NF (dB)
4.0
6.0 NF, -30 4.0 NF, 25 NF, 85 2.0
3.0
NF, -30 NF, 25
2.0
NF, 85
1.0
0.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3
0.0 2.7 2.8 2.9 3.0 3.1 3.2
VCC (V)
VCC (V)
Rev A4 001016
8-87
RF2449
Preliminary
8
FRONT-ENDS
8-88
Rev A4 001016

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